Geometrical Properties of Half Circle

Diameter

d =   m

Area

A = π·d²8 m²

Perimeter

P = π·d2 + d m

Centroid

y_c = d2 m

z_c = 2·d3·π m

Second moments of area

I_y = (π128 – 118·π)·d⁴ m⁴

I_z = π·d⁴128 m⁴

Polar moment of area

I_x = I_y + I_z m⁴

Radii of gyration

r_y =  I_yA m

r_z =  I_zA m

r_x =  I_xA m